Method for removing CO from sintering flue gas after denitration and dust removal integration

Abstract

The invention relates to the technical field of flue gas treatment, in particular to a sintering flue gas denitration and dust removal integrated post-CO removal method which is specifically completed through cooperation of a sintering flue gas treatment system, and the sintering flue gas treatment system comprises a GGH heat exchanger, a desulfurization reactor, a denitration dust remover and a CO reactor which are sequentially communicated through pipelines. The CO catalyst module is a transition metal oxide CO catalyst; the cleaning device is used for cleaning ash of the CO catalyst module; the ammonia gas is sprayed into the outlet of the desulfurization reactor, so that ammonia escape is reduced, poisoning of the CO catalyst module is reduced, the catalytic efficiency of the CO catalyst module is improved, and the service life of the CO catalyst module is prolonged; the CO catalyst module is regularly subjected to air blowing and back blowing in a closed area, so that impurities such as carbon deposition on the CO catalyst module are cleaned, more active sites are exposed, the service life of the CO catalyst module is prolonged, and the investment and operation cost is reduced by adopting a transition metal oxide CO catalyst.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas treatment, and in particular to a method for removing CO from sintering flue gas after integrated denitration and dust removal. Background Art

[0002] With the continuous deepening of air pollution prevention and control work, the emission requirements for carbon monoxide are also increasing. At present, the control methods for particulate matter, NOx, SO2 and CO in sintering flue gas are mainly desulfurization + dust removal + SCR denitrification + CO reactor. The existing sintering flue gas treatment system has too large operating resistance, low dust filtration accuracy, easy clogging of denitrification and CO catalysts, and large fluctuations in SO2 concentration, which can easily cause CO catalyst poisoning and lead to a short service life; the precious metal catalysts used in the market, such as platinum and palladium, are expensive and have high operating costs. The entire sintering flue gas treatment system occupies a large area and has high investment.

[0003] Based on this, the present invention provides a flue gas decarbonization method which can extend the service life of a CO catalyst and reduce the use cost of the CO catalyst. Summary of the invention

[0004] The present invention provides a method for decarbonizing sintering flue gas after integrated denitration and dust removal, which is specifically completed by cooperating with a sintering flue gas treatment system, including a GGH heat exchanger, a desulfurization reactor, a denitration dust collector, and a CO reactor which are sequentially connected through pipelines, wherein a multi-stage CO catalyst module is arranged inside the CO reactor, and the flue gas enters the GGH heat exchanger and is heated up before flowing through the desulfurization reactor for desulfurization, and then flows into the denitration dust collector for denitration and dust removal, and then the flue gas decarbonized by the CO reactor enters the GGH heat exchanger for heat exchange and is discharged, and ammonia is sprayed into the outlet of the desulfurization reactor.

[0005] The sintering flue gas treatment system also includes a cleaning device for cleaning the CO catalyst module, the cleaning device includes a cleaning member for pressurized blowing of different local areas of the CO catalyst module, the cleaning member includes a closing portion distributed on the upper and lower sides of the CO catalyst module and a blowing portion for blowing air toward the upper surface of the CO catalyst module, the closing portion includes a mounting frame that moves back and forth laterally and a closing cover that slides up and down on one side of the mounting frame, a back-blowing portion is provided on the lower closing cover, and the working time of the back-blowing portion is shorter than that of the blowing portion.

[0006] A one-way sealing member is arranged in the upper sealing cover. When the blowing part is working, the one-way sealing member is opened, and when the back-blowing part is working, the one-way sealing member is closed.

[0007] In one possible implementation, the mounting frame is composed of a vertical plate and a horizontal plate fixed in the middle of the vertical plate, a No. 1 spring is fixedly connected to the lower surface of the horizontal plate, an upper end of the closing cover is fixedly connected to the No. 1 spring, a telescopic column is also fixedly connected to the top end of the closing cover, and the telescopic column slides through the horizontal plate of the mounting frame, a wedge-shaped top block is horizontally slidably provided on the vertical plate of the mounting frame, and the inclined surface of the wedge-shaped top block abuts against the end of the telescopic column away from the closing cover.

[0008] In one possible implementation, the backblowing portion includes a plurality of branch pipes disposed in a lower closed cover and a main pipe installed inside the closed cover. The main pipe is a meandering pipe that is not connected end to end. The plurality of branch pipes are fixed and connected to the main pipe. The inlet end of the main pipe is fixedly connected to a No. 2 air inlet pipe.

[0009] In one possible implementation, the bottom wall of the lower closed cover is also provided with an ash discharge portion, which includes a discharge slope arranged in the middle of the bottom wall of the lower closed cover, and the bottom wall of the closed cover is located on both sides of the discharge slope with a guide slope respectively provided, and the height of the guide slope away from the discharge slope is higher than the height of the side close to the discharge slope, and the side wall of the closed cover is provided with an ash outlet corresponding to the lowest point of the discharge slope.

[0010] In a possible implementation, the cleaning device also includes a mobile driving group, which includes a transverse square tube that pushes the mounting frame to move back and forth laterally and a moving part that pushes the wedge-shaped top block to move back and forth laterally, the transverse square tube slides through the outer shell of the CO reactor and is fixedly connected to the vertical plate of the mounting frame, and the moving part includes a pushing bar that is fixed to the wedge-shaped top block and slides through the outer shell of the CO reactor, and the pushing bar can move laterally relative to the transverse square tube.

[0011] In a possible implementation, an impact part is further provided on the upper closed cover, and the impact part includes a strip groove provided on the telescopic column and a lifting rod penetrating a plurality of strip grooves, and cylinders are fixed to both ends of the lifting rod. The impact part also includes a horizontal bar fixed to the inner wall of the CO reactor and corresponding to the cylinder, and a wavy groove is provided on the horizontal bar, and the cylinder is slidably arranged in the wavy groove. A connecting rod is fixedly connected to the lower end of the lifting rod corresponding to the position of each telescopic column, and the connecting rod passes through the closed cover and leads to the interior of the closed cover. The ends of the plurality of connecting rods are commonly connected to a synchronous plate, and a hammer head is fixedly connected to the bottom end of the synchronous plate.

[0012] In one possible implementation, the one-way closure member includes a fixed frame fixed to the inner wall of the closure cover and a lifting frame connected to the bottom of the fixed frame by a steel cable, the fixed frame and the lifting frame are in sliding contact with the synchronization plate, the lifting frame is in sliding contact with the inner wall of the closure cover, both the fixed frame and the lifting frame are provided with air holes, and the air holes on the lifting frame are trapezoidal in shape, with the air holes being small at the top and large at the bottom, a trapezoidal sealing plate is provided in the trapezoidal air holes, the upper end of the trapezoidal sealing plate is fixedly connected to the bottom of the fixed frame by a No. 2 spring, and when the upper side of the trapezoidal sealing plate is not pushed by air pressure, the trapezoidal sealing plate will close the trapezoidal air holes.

[0013] In a possible implementation, there are multiple hammer heads distributed linearly, and the impact positions of the hammer heads are cyclically distributed in the middle, right side, and left side in sequence.

[0014] In one possible implementation, a support member is further provided between the two transverse square tubes, and the support member includes a fixed rod fixed between the free ends of the two transverse square tubes, the fixed rod is fixedly connected to a moving rod via a No. 3 spring, the moving rod is located between the two transverse square tubes, and the upper and lower ends of the moving rod are slidably connected to the outer wall of the transverse square tube.

[0015] In one possible implementation, the CO catalyst module is a transition metal oxide CO catalyst, the denitrification dust collector and the denitrification dust filter bag are integrated, and the sintering flue gas treatment system also includes a linkage device, which can adjust the hot blast furnace intake volume by increasing the temperature of the flue gas after absorbing heat after being catalyzed by the CO catalyst module.

[0016] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0017] 1. The present invention reduces ammonia escape by injecting ammonia at the outlet of the desulfurization reactor, thereby reducing the poisoning of the CO catalyst module and improving the catalytic efficiency and service life of the CO catalyst module; the CO catalyst module is regularly blown and back-blown in a closed area to clean impurities such as carbon deposits on the CO catalyst module, exposing more active sites and delaying the saturation time and service life of the CO catalyst module; a one-way sealing member can be used to prevent carbon deposits and impurities from piling up on the upper surface of the CO catalyst module when back-blowing the CO catalyst module, and a transition metal oxide CO catalyst is used to reduce investment and operating costs.

[0018] 2. The present invention adopts a combination process of baking soda dry secondary fine desulfurization and high-efficiency denitrification dust removal filter bags to improve the efficiency of desulfurization and denitrification, protect the CO catalyst module, and further increase the service life of the CO catalyst module.

[0019] 3. The present invention integrates dust removal and denitrification to reduce the number of process steps, reduce floor space, and reduce investment and operating costs.

[0020] 4. The heat released during decarbonization of the present invention is absorbed by the flue gas, and the flue gas with increased temperature is discharged after heat exchange through the GGH heat exchanger. When the flue gas enters the GGH heat exchanger through the flue gas duct after desulfurization, the temperature rise is greater, which can further reduce the gas consumption of the hot blast furnace.

[0021] 5. In addition to blowing air to the CO catalyst module, the present invention can also perform mechanical vibration on it, thereby improving the efficiency of dropping carbon deposits and impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a sintering flue gas treatment flow chart provided in an embodiment of the present invention.

[0023] Figure 2 It is a three-dimensional structural schematic diagram of a CO reactor and a cleaning device provided in an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the CO reactor provided by an embodiment of the present invention after the front shell is opened.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the cleaning member and the impact part provided in an embodiment of the present invention.

[0026] Figure 5 It is a schematic diagram of the internal structure of the sealing cover after being cut away provided by an embodiment of the present invention.

[0027] Figure 6 It is a schematic structural diagram of a one-way closure provided in an embodiment of the present invention.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the transverse square tube and the support member provided in an embodiment of the present invention.

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the transverse square tube, the support member and the moving part provided in an embodiment of the present invention.

[0030] Fig. 9 It is a schematic structural diagram of the lower closing cover provided by an embodiment of the present invention.

[0031] Fig.10 It is a partial structural schematic diagram of the backflush unit provided in an embodiment of the present invention.

[0032] Fig.11 It is a schematic structural diagram of the ash discharge part provided in an embodiment of the present invention.

[0033] In the figure: 1. GGH heat exchanger; 2. Desulfurization reactor; 3. Denitration dust collector; 4. Denitration dust filter bag; 5. CO reactor; 6. CO catalyst module; 7. Cleaning device; 8. Fan; 9. Chimney; 10. Linkage device; 71. Cleaning piece; 711. Mounting frame; 712. Enclosed cover; 713. Telescopic column; 714. No. 1 spring; 715. Wedge-shaped top block; 716. No. 1 intake pipe; 721. Main pipe; 722. Branch pipe; 723. No. 2 intake pipe; 731. Material guide slope; 732. Discharge slope; 74. Impact part ;741, strip groove;742, lifting rod;743, cylinder;744, horizontal bar;745, wavy groove;746, connecting rod;747, synchronous plate;748, hammer head;751, fixed frame;752, steel cable;753, lifting frame;754, trapezoidal sealing plate;755, No. 2 spring;76, transverse square tube;77, support member;771, fixed rod;772, No. 3 spring;773, moving rod;78, moving part;781, pushing strip;782, connecting frame;783, U-shaped plate;784, electric push rod. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] See also Figure 1 and Figure 3A method for de-CO after integrated denitration and dust removal of sintering flue gas is completed by a sintering flue gas treatment system. The flue gas treatment system includes a GGH heat exchanger 1, a desulfurization reactor 2, a denitration dust collector 3, and a CO reactor 5 which are sequentially connected through pipelines, wherein the air inlet end of the GGH heat exchanger 1 is connected to the external flue gas flue after desulfurization, the denitration dust collector 3 is integrated with the denitration dust filter bag 4, and a multi-stage CO catalyst module 6 is arranged inside the CO reactor 5. After the flue gas is desulfurized once, it enters the GGH heat exchanger 1 from the flue gas flue after desulfurization, and is heated by the GGH heat exchanger 1 and then vented by the hot blast furnace. After supplementary heating to 235°C, the flue gas enters the desulfurization reactor 2 through a pipeline. The desulfurization agent baking soda is sprayed at the inlet of the desulfurization reactor 2 to perform secondary desulfurization on the flue gas. Ammonia is sprayed at the outlet of the desulfurization reactor 2 to perform a selective catalytic reduction reaction to improve the denitrification efficiency and reduce ammonia escape. The flue gas then enters the denitrification dust collector 3 for denitrification, and is denitrified and dusted by the denitrification dust removal filter bag 4. Subsequently, the denitrified and dusted flue gas enters the CO reactor 5, where CO is removed under the catalytic action of the CO catalyst module 6. The clean flue gas after the reaction enters the GGH heat exchanger 1 for heat exchange, and is finally discharged from the chimney 9 by the fan 8.

[0036] It should be noted that the CO catalyst module 6 is a transition metal oxide CO catalyst, which reduces investment and operating costs compared to precious metals.

[0037] See also Figure 1 The filtration accuracy of the denitrification dust removal filter bag 4 is 0.03µm. The denitrification dust removal filter bag 4 is a composite structure of an expanded polytetrafluoroethylene membrane and a catalyst polytetrafluoroethylene composite felt layer. When the flue gas enters the denitrification dust collector 3, the flue gas first contacts the expanded polytetrafluoroethylene membrane on the surface of the denitrification dust removal filter bag 4 to filter and remove the particulate matter in the flue gas. The passing flue gas begins to contact the catalyst polytetrafluoroethylene composite felt layer. At this time, the NOx in the flue gas reacts with the catalyst in the catalyst polytetrafluoroethylene composite felt layer to generate N2 and H2O. After the flue gas passes through the catalyst polytetrafluoroethylene composite felt layer, the NOx concentration in the flue gas drops below the emission standard limit. The catalyst here is a denitrification catalyst.

[0038] See also Figure 2 and Figure 3 The sintering flue gas treatment system also includes a cleaning device 7 for cleaning the CO catalyst module 6. The CO catalyst module 6 is regularly cleaned by the cleaning device 7 to restore the activity of the CO catalyst module 6, extend the service life of the CO catalyst module 6, and further reduce the cost of flue gas decarbonization.

[0039] See also Figure 2 , Figure 3 , Figure 4 and Fig. 9The CO catalyst modules 6 inside the CO reactor 5 are evenly distributed from top to bottom, and each level of the CO catalyst module 6 corresponds to a cleaning device 7, the cleaning device 7 includes a cleaning member 71 for pressurizing and blowing different local areas of the CO catalyst module 6, the cleaning member 71 includes a sealing portion symmetrically distributed on the upper and lower sides of the CO catalyst module 6 and a blowing portion for blowing air to the upper surface of the CO catalyst module 6, the sealing portion includes a mounting frame 711 that moves back and forth laterally and a sealing cover 712 that slides up and down on one side of the mounting frame 711, and the mounting frame 711 drives the sealing cover 712 to move laterally, and different areas of the CO catalyst module 6 can be selected for sealing, and the two sealing covers 712 will contact the outer surface of the CO catalyst module 6 when they are close to each other and seal the local area of ​​the CO catalyst module 6, and when the two sealing covers 712 are away from each other, the sealing of the local area of ​​the CO catalyst module 6 is released; the air is blown into the closed space by the blowing portion, and the high-speed gas blows the carbon deposits, dust and particulate matter on the CO catalyst module 6.

[0040] See also Figure 4 The mounting frame 711 is composed of a vertical plate and a horizontal plate fixed in the middle of the vertical plate. A No. 1 spring 714 is fixedly connected to the lower surface of the horizontal plate. The upper end of the closing cover 712 is fixedly connected to the No. 1 spring 714. The top of the closing cover 712 is also fixedly connected to a telescopic column 713, and the telescopic column 713 slides through the horizontal plate of the mounting frame 711. A wedge-shaped top block 715 is provided on the vertical plate of the mounting frame 711 for horizontal sliding, and the inclined surface of the wedge-shaped top block 715 abuts against one end of the telescopic column 713 away from the closing cover 712. When the wedge-shaped top block 715 moves horizontally, it will contact the telescopic column 713 to drive the closing cover 712 to slide in the vertical direction. The setting of the No. 1 spring 714 is to enable the telescopic column 713 to automatically drive the two closing covers 712 to separate when it is not pushed by the wedge-shaped top block 715, thereby releasing the sealing of the local area of ​​the CO catalyst module 6.

[0041] It should be noted that there are multiple No. 1 springs 714 and telescopic columns 713, and the two are alternately distributed to ensure that the sealing cover 712 is evenly stressed.

[0042] See also Figure 5 The blowing part is a No. 1 air inlet pipe 716, which passes through the outer wall of the CO reactor 5 and the vertical plate of the mounting frame 711 and is connected to the upper closed cover 712. The No. 1 air inlet pipe 716 is connected to an external air pump. The flow direction of the airflow is as follows: Figure 6 The arrow points to the middle.

[0043] Since the thickness of the CO catalyst module 6 is relatively thick, when blowing air toward the upper surface of the CO catalyst module 6, the gas will encounter a certain resistance, making it difficult to blow away the carbon deposits, dust and particulate matter near the lower surface of the CO catalyst module 6. In order to make the cleaning of the CO catalyst module 6 more thorough, a back-blowing portion is provided on the lower sealing cover 712, such as Fig. 9 and Fig.10 As shown, the back-blowing portion includes a plurality of branch pipes 722 arranged in the lower closed cover 712 and a main pipe 721 installed inside the closed cover 712. The main pipe 721 is a circular pipe that is not connected at the head and tail. The plurality of branch pipes 722 are fixed and connected to the main pipe 721. The inlet end of the main pipe 721 is fixedly connected with a No. 2 air intake pipe 723, and the No. 2 air intake pipe 723 is supplied with air by an external air pump.

[0044] It should be noted that the working time and working frequency of the back-blowing part shall not exceed those of the blowing part, so as to ensure that the carbon deposits, dust and particles blown off have an overall downward trend to facilitate their later discharge.

[0045] See also Fig. 9 and Fig.11 The bottom wall of the closed cover 712 below is also provided with an ash discharge portion, which includes a guide slope 731 and a discharge slope 732. The discharge slope 732 is provided in the middle of the bottom wall of the closed cover 712 below. The bottom wall of the closed cover 712 is located on both sides of the discharge slope 732, and each side has a guide slope 731. The height of the guide slope 731 away from the discharge slope 732 is higher than the height of the side close to the discharge slope 732. The side wall of the closed cover 712 is provided with an ash outlet corresponding to the lowest point of the discharge slope 732.

[0046] See also Figure 2 , Figure 7 , Figure 8 and Fig. 9 The cleaning device 7 also includes a mobile driving group, which includes a transverse square tube 76 that pushes the mounting frame 711 to move back and forth horizontally and a moving part 78 that pushes the wedge-shaped top block 715 to move back and forth horizontally. The transverse square tube 76 slides through the shell of the CO reactor 5 and is fixedly connected to the vertical plate of the mounting frame 711. The No. 1 air inlet pipe 716 is located in the upper transverse square tube 76, and the No. 2 air inlet pipe 723 is located in the lower transverse square tube 76. The vertical plate of the mounting frame 711 is provided with avoidance slots at positions corresponding to the transverse square tubes 76, which facilitate the No. 1 air inlet pipe 716 and the No. 2 air inlet pipe 723 to pass through. The avoidance slots on the mounting frame 711 at the bottom are connected to the ash outlet on the closed cover 712 at the bottom through a telescopic pipe (not shown in the figure), which facilitates the carbon deposits, dust and particulate matter blown off to be discharged from the ash outlet through the telescopic pipe to the transverse square tube 76 at the bottom.

[0047] It should be noted that a sealing door is hinged at the bottom of the lower transverse square tube 76. When the sealing door on the transverse square tube 76 moves to the outside of the CO reactor 5, it can be opened to discharge carbon deposits, dust and particulate matter.

[0048] See also Figure 7 and Figure 8 A support member 77 is also provided between the two transverse square tubes 76, and the support member 77 includes a fixed rod 771 fixed between the free ends of the two transverse square tubes 76, and the fixed rod 771 is fixedly connected to a moving rod 773 through a No. 3 spring 772, and the moving rod 773 is located between the two transverse square tubes 76, and the upper and lower ends of the moving rod 773 are slidably connected to the outer wall of the transverse square tube 76. When the transverse square tube 76 pushes the cleaning member 71 to move inside the CO reactor 5, the moving rod 773 will gradually approach the outer wall of the CO reactor 5. When the moving rod 773 fits the outer wall of the CO reactor 5, it continues to push the transverse square tube 76, and the No. 3 spring 772 will be gradually compressed. At this time, the distance between the fixed rod 771 and the moving rod 773 will gradually decrease. The setting of the support member 77 ensures that the two transverse square tubes 76 with longer lengths will not be offset due to the cantilever effect.

[0049] See also Figure 2 , Figure 4 and Figure 8 The moving part 78 includes a pushing bar 781 fixed to the wedge-shaped top block 715 and slidingly passing through the shell of the CO reactor 5. The upper and lower pushing bars 781 are fixedly connected by a connecting frame 782. The connecting frames 782 are distributed on both sides of the pushing bar 781, and the two connecting frames 782 are fixedly connected by a U-shaped plate 783. The U-shaped plate 783 and the support member 77 are fixedly connected by an electric push rod 784. Specifically, the U-shaped plate 783 and the fixed rod 771 are fixedly connected by the electric push rod 784; when the transverse square tube 76 moves, the moving part 78 will be driven to move synchronously. When the electric push rod 784 is extended and retracted, the electric push rod 784 can drive the pushing bar 781 to move relative to the transverse square tube 76, so that the wedge-shaped top block 715 can push the telescopic column 713 and the closed cover 712, so that the closed cover 712 moves closer to or away from each other.

[0050] See also Figure 4 and Figure 5In order to further increase the cleaning effect of the blowing part and the back-blowing part, an impact part 74 is also provided on the upper closing cover 712, and the impact part 74 includes a strip groove 741 provided on the telescopic column 713 and a lifting rod 742 passing through a plurality of strip grooves 741, and a cylinder 743 is fixed at both ends of the lifting rod 742, and the impact part 74 also includes a horizontal bar 744 fixed on the inner wall of the CO reactor 5 and corresponding to the cylinder 743, and a wavy groove 745 is provided on the horizontal bar 744, and the cylinder 743 slides The lifting rod 742 is dynamically arranged in the wavy groove 745, and the lower end of the lifting rod 742 is fixedly connected with a connecting rod 746 corresponding to the position of each telescopic column 713. The connecting rod 746 passes through the closed cover 712 and leads to the interior of the closed cover 712. The ends of the multiple connecting rods 746 are commonly connected with a synchronous plate 747, and the bottom end of the synchronous plate 747 is fixedly connected with a hammer head 748; there are multiple hammer heads 748 distributed linearly, and the impact positions of the multiple hammer heads 748 are cyclically distributed in the order of the middle, the right side and the left side.

[0051] It should be noted that when the transverse square tube 76 drives the cleaning piece 71 to move horizontally to switch the blowing position, the cylinder 743 will also be driven synchronously. At this time, the cylinder 743 moves in the wavy groove 745. The shape of the wavy groove 745 guides the cylinder 743 to move back and forth in the vertical direction, so that the cylinder 743 drives the lifting rod 742 to move back and forth up and down, and then drives the hammer head 748 to knock on the upper surface of the CO catalyst module 6, and vibrates the carbon deposits by mechanical knocking, making it easier to be blown off.

[0052] See also Figure 5 and Figure 6 In order to prevent dust from being blown into the upper transverse square tube 76 during backblowing, a one-way sealing member is also provided in the upper sealing cover 712. The one-way sealing member includes a fixed frame 751 fixed to the inner wall of the sealing cover 712 and a lifting frame 753 connected to the bottom of the fixed frame 751 through a steel cable 752. The fixed frame 751 and the lifting frame 753 are both slidably connected to the synchronous plate 747. The lifting frame 753 is in sliding contact with the inner wall of the sealing cover 712. Air holes are provided on the fixed frame 751 and the lifting frame 753. The air holes on the lifting frame 753 are trapezoidal in shape with a small upper part and a large lower part. A trapezoidal sealing plate 754 is provided in the trapezoidal air holes. The upper end of the trapezoidal sealing plate 754 is fixedly connected to the bottom of the fixed frame 751 through a No. 2 spring 755. When the trapezoidal sealing plate 754 is not pushed by air pressure, the trapezoidal sealing plate 754 closes the trapezoidal air holes.

[0053] During blowing, the air flow enters the upper closed cover 712 and flows downward through the air holes on the fixed frame 751. The air pressure acts on the trapezoidal sealing plate 754, pressing the trapezoidal sealing plate 754 to move downward. At this time, the No. 2 spring 755 is gradually stretched, and the trapezoidal sealing plate 754 no longer closes the trapezoidal air holes. The air flow is discharged from the space between the trapezoidal sealing plate 754 and the air holes to the bottom, and finally blows to the upper surface of the CO catalyst module 6.

[0054] During backblowing, the airflow enters the closed cover 712 below and then blows toward the lower surface of the CO catalyst module 6. The blown-off carbon deposits will float upward. When the airflow gradually passes through the CO catalyst module 6 and overflows into the closed cover 712 above, the trapezoidal sealing plate 754 is tightly attached to the trapezoidal air vents under the pulling force of the No. 2 spring 755 and the pushing action of the airflow. As the air pressure on the lower surface of the lifting frame 753 gradually increases, the lifting frame 753 moves upward under the push of the air pressure, and the steel cable 752 changes from a suspended state to a curled state. At this time, the space used to seal the CO catalyst module 6 becomes larger. By moving the lifting frame 753 upward, not only the air pressure in the closed space of the CO catalyst module 6 is adjusted during backblowing, but also the carbon deposits can be prevented from being blown back toward the upper transverse square tube 76. During the next blowing, the floating carbon can be better blown into the closed cover 712 below.

[0055] See also Figure 1 The sintering flue gas treatment system also includes a linkage device 10, which can adjust the air intake of the hot blast furnace by increasing the temperature of the flue gas after absorbing heat after being catalyzed by the CO catalyst.

[0056] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0057] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for removing CO from sintering flue gas after integrated denitration and dust removal, which is specifically completed by using a sintering flue gas treatment system, comprising a GGH heat exchanger (1), a desulfurization reactor (2), a denitration dust collector (3), and a CO reactor (5) which are sequentially connected through pipelines, wherein a multi-stage CO catalyst module (6) is arranged inside the CO reactor (5), and the flue gas enters the GGH heat exchanger (1) and is heated, then flows through the desulfurization reactor (2) for desulfurization, then flows into the denitration dust collector (3) for denitration and dust removal, and then the flue gas after decarbonization through the CO reactor (5) enters the GGH heat exchanger (1) for heat exchange and then is discharged, characterized in that: Ammonia is sprayed into the outlet of the desulfurization reactor (2), and the CO catalyst module (6) is a transition metal oxide CO catalyst; The sintering flue gas treatment system also includes a cleaning device (7) for cleaning the CO catalyst module (6), the cleaning device (7) including a cleaning member (71) for pressurized blowing of different local areas of the CO catalyst module (6), the cleaning member (71) including a sealing portion distributed on the upper and lower sides of the CO catalyst module (6) and a blowing portion for blowing air toward the upper surface of the CO catalyst module (6), the sealing portion including a mounting frame (711) that moves back and forth laterally and a sealing cover (712) that is slidably arranged on one side of the mounting frame (711), a back-blowing portion is arranged on the lower back-blowing cover (712), and the working time of the back-blowing portion is shorter than that of the blowing portion; A one-way sealing member is arranged in the upper sealing cover (712). When the air blowing part is working, the one-way sealing member is opened, and when the back-blowing part is working, the one-way sealing member is closed.

2. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 1, characterized in that: The mounting frame (711) is composed of a vertical plate and a horizontal plate fixed in the middle of the vertical plate. A No. 1 spring (714) is fixedly connected to the lower surface of the horizontal plate. The upper end of the closing cover (712) is fixedly connected to the No. 1 spring (714). A telescopic column (713) is also fixedly connected to the top end of the closing cover (712). The telescopic column (713) slides through the horizontal plate of the mounting frame (711). A wedge-shaped top block (715) is horizontally slidably arranged on the vertical plate of the mounting frame (711). The inclined surface of the wedge-shaped top block (715) abuts against one end of the telescopic column (713) away from the closing cover (712).

3. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 1, characterized in that: The back-blowing section comprises a plurality of branch pipes (722) arranged in a lower closed cover (712) and a main pipe (721) installed inside the closed cover (712); the main pipe (721) is a circular pipe that is not connected at the head and tail; the plurality of branch pipes (722) are fixed and connected to the main pipe (721); and the inlet end of the main pipe (721) is fixedly connected to a second air inlet pipe (723).

4. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 1, characterized in that: The bottom wall of the lower closed cover (712) is also provided with an ash discharge portion, which includes a discharge slope (732) arranged in the middle of the bottom wall of the lower closed cover (712), and the bottom wall of the closed cover (712) is located on both sides of the discharge slope (732) and is provided with a guide slope (731), the height of the guide slope (731) away from the discharge slope (732) is higher than the height of the side close to the discharge slope (732), and the side wall of the closed cover (712) is provided with an ash outlet at the lowest point of the discharge slope (732).

5. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 2, characterized in that: The cleaning device (7) further comprises a moving drive group, the moving drive group comprising a transverse square tube (76) for pushing the mounting frame (711) to move back and forth in a transverse direction, and a moving part (78) for pushing the wedge-shaped top block (715) to move back and forth in a transverse direction, the transverse square tube (76) slidingly passes through the outer shell of the CO reactor (5) and is fixedly connected to the vertical plate of the mounting frame (711), the moving part (78) comprising a pushing bar (781) fixed to the wedge-shaped top block (715) and slidingly passing through the outer shell of the CO reactor (5), the pushing bar (781) being capable of moving laterally relative to the transverse square tube (76).

6. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 2, characterized in that: The upper sealing cover (712) is also provided with an impact part (74), the impact part (74) comprising a strip groove (741) provided on the telescopic column (713) and a lifting rod (742) penetrating the plurality of strip grooves (741), the lifting rod (742) being fixed with a cylinder (743) at both ends, the impact part (74) further comprising a horizontal bar (744) fixed to the inner wall of the CO reactor (5) and corresponding to the cylinder (743), the horizontal bar (744) being provided with a A wave-shaped groove (745) is provided, and a cylinder (743) is slidably arranged in the wave-shaped groove (745). The lower end of the lifting rod (742) is fixedly connected with a connecting rod (746) corresponding to the position of each telescopic column (713). The connecting rod (746) passes through the closed cover (712) and leads to the inside of the closed cover (712). The ends of the plurality of connecting rods (746) are commonly connected with a synchronous plate (747), and the bottom end of the synchronous plate (747) is fixedly connected with a hammer head (748).

7. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 6, characterized in that: The one-way sealing member comprises a fixed frame (751) fixed to the inner wall of the sealing cover (712) and a lifting frame (753) connected to the bottom of the fixed frame (751) through a steel cable (752). The fixed frame (751) and the lifting frame (753) are both in sliding contact with the synchronous plate (747). The lifting frame (753) is in sliding contact with the inner wall of the sealing cover (712). Air holes are provided on the fixed frame (751) and the lifting frame (753). The air holes on the lifting frame (753) are in a trapezoidal shape with a small top and a large bottom. A trapezoidal sealing plate (754) is provided in the trapezoidal air holes. The upper end of the trapezoidal sealing plate (754) is fixedly connected to the bottom of the fixed frame (751) through a No. 2 spring (755). When the upper side of the trapezoidal sealing plate (754) is not pushed by air pressure, the trapezoidal sealing plate (754) seals the trapezoidal air holes.

8. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 6, characterized in that: There are a plurality of hammer heads (748) distributed linearly, and the impact positions of the hammer heads (748) are cyclically distributed in the middle, right side, and left side in sequence.

9. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 5, characterized in that: A support member (77) is also provided between the two transverse square tubes (76), and the support member (77) comprises a fixed rod (771) fixed between the free ends of the two transverse square tubes (76), and the fixed rod (771) is fixedly connected to a moving rod (773) via a No. 3 spring (772), and the moving rod (773) is located between the two transverse square tubes (76), and the upper and lower ends of the moving rod (773) are slidably connected to the outer wall of the transverse square tube (76).

10. The method for removing CO from sintering flue gas after integrated denitration and dust removal according to claim 5, characterized in that: The denitration dust collector (3) and the denitration dust filter bag (4) are arranged in an integrated manner. The sintering flue gas treatment system also includes a linkage device (10). The linkage device (10) can adjust the air intake of the hot blast furnace by increasing the temperature of the flue gas after absorbing heat after being catalyzed by the CO catalyst module (6).

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